223K accounts from RuneScape Boards (rsboards.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesIP addressesPasswordsUsernames
In around 2011, the now defunct RuneScape Boards forum (also known as RSBoards) suffered a data breach that was later redistributed as part of a larger corpus of data. The vBulletin-based service exposed 223k unique email addresses along with usernames, IP addresses and salted MD5 password hashes.
Source: Have I Been Pwned (CC BY 4.0)